3D Printer HEPA filter 80mm Roomba

thingiverse

The HEPA filter for 3D printer enclosure is designed to take advantage of old fans, specifically the 80mm standard fan that has been widely used on PCs and electronics devices over the last 20 years. This Hepa filter leverages the airflow performance against air pressure of the 80mm fan, making it a reliable option for various configurations. You can use it as you see fit, whether that's for recycling or exhausting hot air from your enclosure. When considering an exhaust configuration to pull hot air out and intake fresh air, be mindful of how much air is being pulled without compromising temperature control. To avoid issues, mounting a temperature relay to stop the fan when the temp drops below target is a reliable option. Alternatively, you can adjust the fans to low RPM using a DC-DC or PWM module if your fan supports this feature. If your 3D printer main board has free GPIOs, setting up a temp probe and a relay to control by the printer is also a viable solution. The design of this HEPA filter takes into account three primary configurations: free exhaust for recycling air inside the enclosure, connected to an 80mm duct, or mounted with a 90º adapter to exhaust air through the enclosure. All printable parts are designed to be the same shape and are compatible across these configurations. To avoid fluctuations in recycling setups, use the short exhaust option; for connecting with an 80mm duct, opt for the long exhaust; and for mounting directly on the enclosure surface, use the 90º adapter. When using axial fans to pull air from a filter, you may encounter issues due to limited air pressure. However, stacking two or more 80mm fans works best when they're equal in size, resulting in consistent airflow. Use the coupler included in the design to minimize fluctuations and maximize performance. The HEPA filters used for Roomba series 800-900 are affordable and easily sourced online, extending the time between replacements. All screws are M4, and holes are 4.5mm. Considering this design, I plan to create a Butterfly manual valve in the future, as seen on Thingiverse (https://www.thingiverse.com/thing:4216080).